README

You can calculate classical mathematical expressions with variables, or you can specify your own calculation rules, operators or custom functions

Forked from NeonXP/MathExecutor (https://github.com/NeonXP/MathExecutor), but advanced and improved.

Jump To:

• Installation
• Simple Usage
• Default operators and functions
• Variables
• Multiple expressions
• Extra operators and functions
• Custom functions
• Custom operators
• Interpreting of identifiers
• Non-numeric values
• Error Handlers

Installation

|$ composer require avadim/ace-claculator

All instructions to install here: https://packagist.org/packages/avadim/ace-claculator

Sample Usage

require 'vendor/autoload.php';
// create the calculator
$calculator = new \avadim\AceClaculator\AceClaculator();

// calculate expression
print $calculator->execute('1 + 2 * (2 - (4+10))^2 + sin(10)');

// cascade execution - you can calculate a series of expressions 
// variable $_ has result of previous calculation
print $calculator
        ->calc('4+10')
        ->calc('1 + 2 * (2 - $_)^2') // the variable $_ contains the result of the last calculation
        ->calc('$_ + sin(10)')
        ->result();

Default operators, functions and constants

Default operators: + - * / ^

Arithmetic functions

• abs()
• avg()
• ceil()
• exp()
• expm1()
• floor()
• fmod()
• hypot()
• intdiv()
• log()
• log10()
• log1p()
• max()
• min()
• sqrt()
• round()

Trigonometric functions

• acos()
• acosh()
• asin()
• asinh()
• atan()
• atan2()
• atanh()
• atn() (alias of atan)
• cos()
• cosh()
• deg2rad()
• degrees() (alias of rad2deg)
• rad2deg()
• radians() (alias of deg2rad)
• sin()
• sinh()
• tan()
• tanh()
• tn() (alias of tan)

Default constants

PI = 3.14159265358979323846 E = 2.7182818284590452354

Also you can use any standard math constants from PHP - M_LOG2E, M_PI_2 etc

$calculator->execute('cos(PI)');
$calculator->execute('cos(M_PI)'); // the same result

Variables

You can add own variables to executor and use their in expressions

$calculator->setVars([
    'var1' => 0.15,
    'var2' => 0.22
]);

// calculation with variables
$calculator->execute('$var1 + $var2');

// calculate and assign result to $var3
$calculator->execute('$var1 + $var2', '$var3');

// assign values to variable in expression
$calculator
    ->calc('$var3 = ($var1 + $var2)')
    ->calc('$var3 * 20')
    ->result();

Multiple expressions

You can execute multiple expressions in one by separating them with a semicolon

$result1 = $calculator
    ->setVar('$var1', 0.15)
    ->setVar('$var2', 0.22)
    ->calc('$var3 = $var1 + $var2')
    ->calc('$var3 * 20')
    ->result()
;
// $result2 will be equal $result1
$result2 = $calculator->execute('$var1=0.15; $var2=0.22; $var3 = $var1 + $var2; $var3 * 20');

Extra operators and functions

You can load extensions with extra operators and functions by method loadExtension():

// load extension 'Bool'
$calculator->loadExtension('Bool');

This extension load boolean operators: < <= > >= == != && ||

You can use boolean operators with extra function if()

print $calculator->execute('if(100+20+3 > 111, 23, 34)');

Custom functions

Add custom function to executor:

$calculator->addFunction('dummy', function($a) {
    // do something
    return $result;
});

print $calculator->execute('dummy(123)');

// If the function takes more than 1 argument, you must specify this

// New function hypotenuse() with 2 arguments
$calculator->addFunction('hypotenuse', function($a, $b) {
    return sqrt($a^2 + $b^2);
}, 2);

// New function nround()
//   1 - minimum number of arguments
//   true - used optional arguments
$calculator->addFunction('nround', function($a, $b = 0) {
    return round($a,  $b);
}, 1, true);

print $calculator->execute('nround(hypotenuse(3,4), 2)');

Custom operators

A simple way to add an operator

use avadim\AceCalculator\Token\Operator\TokenOperator;
$func = function (array &$stack)
{
    $op2 = array_pop($stack);
    $op1 = array_pop($stack);
    
    return $op1->getValue() % $op2->getValue();
};

$calculator->addOperator('mod', [TokenOperator::MATH_PRIORITY_DIVIDE, $func]);
echo $calculator->execute('286 mod 100');

Alternative way to add operator using specified class. Create the class of custom operator

<?php
use avadim\AceCalculator\Generic\AbstractToken;
use avadim\AceCalculator\Generic\AbstractTokenOperator;
use avadim\AceCalculator\Token\TokenScalarNumber;

class TokenOperatorModulus extends AbstractTokenOperator
{
    protected static $pattern = 'mod';

    /**
     * Priority of this operator, more value is more priority 
     * (1 equals "+" or "-", 2 equals "*" or "/", 3 equals "^")
     * 
     * @return int
     */
    public function getPriority()
    {
        return 3;
    }

    /**
     * Association of this operator (self::LEFT_ASSOC or self::RIGHT_ASSOC)
     * @return string
     */
    public function getAssociation()
    {
        return self::LEFT_ASSOC;
    }

    /**
     * Execution of this operator
     * @param AbstractToken[] $stack Stack of tokens
     *
     * @return TokenScalarNumber
     */
    public function execute(&$stack)
    {
        $op2 = array_pop($stack);
        $op1 = array_pop($stack);
        $result = $op1->getValue() % $op2->getValue();

        return new TokenScalarNumber($result);
    }
}

And add the class to executor:

$calculator = new avadim\AceClaculator\AceClaculator();
$calculator->addOperator('mod', \TokenOperatorModulus::class);
echo $calculator->execute('286 mod 100');

Interpreting of identifiers

Identifiers - start with a letter and consist of a sequence of letters and numbers. You can specify rules how to interpret them in calculations

$calculator->setIdentifiers([
    'ONE' => 1,
    'YEAR' => function($identifier) { return date('Y'); },
]);

$calculator->execute('YEAR + ONE');

Non-numeric values

Non-numeric values will cause warnings in arithmetic operations. However, you can set a special option to avoid this.

$calculator = new avadim\AceCalculator\AceCalculator();

// calc expression with variable
$calculator->setVar('$x', null);
// There will be a warning in the next line
$calculator->execute('$x * 12');

$calculator->setOption('non_numeric', true);
// And now there will be no warning
$calculator->execute('$x * 12');

Error Handlers

Division by zero

Usually division by zero throws a DivisionByZeroException. But you can redefine this behavior

$s = '10/0';
$calculator->setDivisionByZeroHandler(static function($a, $b) {
    // $a and $b - the first and second operands
    return 0;
});
echo $calculator->execute($s);

Unknown Identifier

Usually unknown identifier throws a UnknownIdentifier. But you can redefine this behavior

$calculator->setIdentifiers([
    'ONE' => 1,
    'TWO' => 2,
]);

// Will throw an exception
echo $calculator->execute('THREE');

$calculator->setUnknownIdentifierHandler(static function($identifier) {
    return $identifier;
});
// Returns name of identifier as string 
echo $calculator->execute('THREE');

$calculator->setUnknownIdentifierHandler(static function($identifier) use ($calculator) {
    return $calculator->execute('ONE + TWO');
});
// Returns result of expression ONE + TWO
echo $calculator->execute('THREE');

Unknown Variable

Usually unknown identifier throws a UnknownIdentifier. But you can redefine this behavior

$calculator = new avadim\AceCalculator\AceCalculator();

// Will throw an exception
$calculator->execute('$a * 4');

// Now any undefined variables will be interpreted as 0
$calculator->setUnknownVariableHandler(static function($variable) {
    return 0;
});
$calculator->execute('$a * 4');

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